You may not need help determining if the beverage you are drinking is hot or cold, but some people might. Luckily, these coasters will tell you just what you need to know: red for hot, blue for cold. A light encapsulated inside the coaster changes to the appropriate color depending on the temperature of your drink.
Empirical evidence shows that there is a great need for temperature awareness in today's modern world. For example, we have specially designed beer packaging that tells us when the beer is cold (hint: it's when the mountains turn blue). And of course, … Read more